Pump, &amp;c.



F. W. MACHLET.l

PUMP, 6.0. APPLICATION FILiED NOV. 20, 1907. 902,501. Patented 0013.27,1908.

4 SHEETS-SHEET 1.

W/7'NESSES F., W., MAGHLET.

PUMP, @0.

APPLICATION FILED NOV. 20, 1907.

fl wwwllm x F. W. MACHLET.

PUMP, 5w.

AI-PLIOATION FILED NOV. 20, 1907.

Patented Oct. 27, 1908.

W/TNESSES P. W. MACHLET.

PUMP, 6m.

APPLICATION FILED NOV. 20, 1907.

92 Patented 0013.27, 1908.

i 4 SHEETS-SHEET 4.

ATTO Ey FRITZ W. MACHLET, OF ELIZABETII, NEW JERSEY.

PUMP, ac.

Specification of Letters Patent.

Patented Oct. 27', 1908.

Application filed Novem'nei` 20, 1907. Serial No. 402,957.

To all whom it may concern:

Be it known that I, FRITZ W. MACHLET, a citizen of the United States,residing in Elizabeth, in the county of Union and State of New Jersey,have invented certain new and useful Improvements in Pumps, &c., ofwhich the following is a specification.

This invention relates principally to liquid seals or packings for thepistons of pum s, blowers, engines, etc., especially those of t e rotarytype, and particularly to blowers or air viiini'iressors; an( it furtherrelates to means for cooling the air compressors or pumps.

I illustrate my invention in connection with a rotary pump of the typeshown in YUnited States Patent No. 825,671 granted to me July 10, 1906,in which is disclosed a ylindraceous drum within which is mountedcccentrically to the drum a cylinder having a double vane or pistonadapted to project alternately from o posite sir es of said cylinderduring each revo ution thereof; the face-wise or revolvingT movements ofthe' double vane being controlled by said cylinder while the radialmovements of the vane in and out of the cylinder are controlled by a hubacting in cooperation with a fixed stud. While there is a large demandfor low pressure air pumps of many kinds, including the type disclosedin said patent, still it has not heretofore been found practicable tosecure by means of said pumps a greater pressure than about four poundsper square inch. I have devised means whereby puni s of this generalclassinay be caused to de iver air steadily at a pressure of many morethan four pounds to the square irmh, and even as high as twenty pounds.The capacity of. pumps of this class has heretofore been limited becauseof the escape of air past the pistons and through the other joints ofthe pump, whenever it has been attempted to produce three or four poundspressure. y I have dcvised means whereby a constant flow of liquid iseffected from a service pipe to the edges of the piston or pistons of arotary pump, to seal said pistons sufficiently to enable pressure of thedelivered air to be raised far abovethat which has heretofore been foundpracticable, and have thus vconverted a low pressure blower to ainodorate-pressure air coinpressor.

In, the the'drawii'igs,` the sealing Yliquid-.is introduced through thestudv and passesrhcnce form of `the invention illustrated in position.

through internal passages formed in the piston or vane to the edges ofthe latter, said edges having recesses which are filled by the liquid,thus forming a seal sufficient to hold the air up to twenty or even morepounds pressure per square inch. This liquid, of course, escapes andgradually collects on the delivery side of the pump or compressor, and Ipreferably arrange a separator to collect the liquidat the delivery sideofthe pump, and the collected liquid is led baci; from the separatorinto the pump through said stud and again begins its circulation. Itwill be understood that the pressure ofthe delivered air issufficient toforce the liquid back through the stud and the piston or vane into thedrum of the pump, so that the circulation is practically unintermittent,and little or noopportunity is given for leakage of air past the piston.The liquid is also forced by the same means through other joints in thepump to seal all of them, with great resultant economy of operation.Preferably a cooling coil is inserted between said separator and saidstud, so that the sealing liquid is cooled before againk entering thepump, and this suffices to counteract the heating tendency of the aircompressing operation, so that the same fiow of liquid serves both toseal the moving p arts and cool the entire pump. The

invention may beapplied to various other.

forms and types of pumps, compressors, blowers and engines, includingengines driven by compressed air or steam.

In the accompanying drawings, Figure 1 is a longitudinal sectionalviewof a ,rotary pump or compressor provided with my iin- I movements. Fig.2 is a transverse section about the line X-X of Fig. 1, but showing thedouble vane or piston in a horizontal position, instead of the verticalposition seen' at Fig'. 1. Fig. 3 is a transverse sectional view showingthe double vane in a vertical position, and also. illustrating themanner of y `connecting the same to its controlling stud.

This View is taken about at the line Y-Y of Fig. 1. Fig. 4 illustrates aseparator provided at the delivery side of the pump and cylinder andpiston ofthe latter. Fig. 5 is a ics view similar to 2 but taken ataboutv the line Y--Y 0f Fig. 1,.` Fig. 6 is a view sie to Fig. 5 .butshowing the piston mi `Figf illustrates a cooliuIk ratiis.

l"the side Walls 5,6 thereof.

v ormed in the head 5.

As set forth in said atent, the cylindraceous drum 1 is provide with aninlet 2 and an outlet 2a, between which is mounted a revoluble cylinder3 eccentric to the drum and running in contact with a saddle or abutment4. The 'cylinder extends the full length of the drum and it's closelybetween Mounted in peripheral slots 7, 8 in the cylinder is adiametrical plate structure, one end ortion 9 of which is `seenat Fig. 3projecting from the cylinder and extending to the inner .periphery 10 ofthe drum, while the other portion 11 of said plate or piston is drawninto the cylinder.

Saidpotions 9 andll constitute op osite istons or vanes, and may beregar -ed as forming a double vane. It extends from wall 5 to wall 64 oithe drum, 1. l

The double vane is formed with a central rectangular recess 12 theopposite edges of which lit into mortises 13 formed rada ly in oppositesides of a hub member or shoe 33.

havlng' a pair of flanges 34, in which are formed said mortises 13. Thehub member is` rigidly secured to the double .vane and controls theendwise or radial position thereof,

being te this .end provided With a transverse slot 15, which isperpendicular to the plane of the double vane, and extends u on op ositesides thereof Within the cylin er 3, t at is, said slot is continuousthrough therecess 12 inthe double vane. In enga ement with this slot isa revoluble slide 19 tted upon a stationary stud 16, which projectsinwardly from the vertical wall 6 of the drum. Said stud extends inthrough a boss 18 formed on the outer side of the drum head. The clinder 3 has aV hub 21 mounted upon a shat 22 provided with-'a fly-wheel23, said hub occupying a cup-like depression vor recess 24 As thecylinder 3 rotates, the doble'vane 9, 10l is carried around vface'wisethereby,

whileowing to the connection ofthe stud 16 with the slotted hub or shoe33, the ti s of the vanes 9, l11 are always equidistant om the said stud16. As the cylinder rotates,

the vanes move radially in and out relatively thereto, the radialpositions of the vanes being always positively controlled by the stud 16independently of the inner periphery of the drum 1, said inner peripherybemgof der l3, as indicated .atl 38.; -V From cylindraceous contour tocorrespond to the path taken by the 'tips or outeredges of the oublevane. The stud 16 1s about central of the dru-m.- The tips of' :thevanesmay clear the in ner periphery 10 of the drum by a few thousandths of aninch, so that friction at lthis point may be eliminated.

The liquid, for sealing the piston and. other joints, enters through apipe 35 and passes through a bore 36formed in the stud 16, and

I escapes directly intovthe' cylinder- 3 through oriiices'37 ,and the.interior of said cylinthence the port 43.

liquid oozes through passages in the double of the double vane to be'lilled with the liquid for the purpose of sealing the latter.v Theliquid passes from the cylinder into the interior of thepiston throughports 40 and 41- formed in cheek B. Said ports are separated lby a block42 corresponding withthe blocks 39 and iilling the space between thecheeks A and B, so that the asJsa es in one vane are out ofcommunicatlon with the passages in the other vane. d

At Fig. 6, one end of the piston is shown as having completed itsdelivery stroke, and its port 41 is closed, so that liquid shall notpass therethrough until this end of the doublepistpn has passed thedelivery andintake ports -43 and 44 of the p'ump, to avoid excessiveloss of the liquid or false movements thereof. The port 41 isself-closing, since the face of the cheek B slides in contact with aplate 45 projecting inwardly from the head 21 of the cylinder 3 andrigidly secured thereto, said plate forming a gate or valve for saidport. The gate 45 serves also for the port 40, and during ther rotationof the pump the valves 40 and 41 are opened and closed in alternation,owing to the endwise movements of the double piston in andl out of thecylinder 3. As will be understood by reference to Figs. 5 and 6, theport 40, which is closed until the piston passes-the portI 44, graduallyopens as the piston rises, and is fully open wheny the latter standsvertically, and from that point gradually closes until the iston reachesthe The ports 40 an 41 are both'preferably on the one side of the doublepiston, and the gate 45 lies alternately under and -so A over the doublepiston, but other forms of ports and valves may be employed and other-Wise operated. The edges of the double piston along the recess L12 areclosed by iilling blocks 46 extending from the head 6 of the drum to theinner end of said recess,- to pre,-

20 piston,

vent the li uid from flowing from the cylinder 3 into t e internalpassages ofthe except through the ports 40 and 41,.

.The liquid, which is supplied to the pump'v under pressure, oozes outfrom the edges of ythe piston, and tends to flow towards the in-4 takeor low 'pressure side of the pump and there to accumulate, as at 47 Thesucceeding blade of the piston picks up some of the 'accumulated liquidat 47, as indicated at48,

to carry the same over to the delivery yside of the pum and it alsosweeps along any liquid that gat ers on the inner periphery 10 and wallsof the drum. Any liquid that ldrops on to either piston, as at L18 or49, is also carried over to the delivery side the accumulation atthelatter point being indicated at 50. This accumulation is preferablydisposed of by means of a separator 51, into which the delivery pipe 52of the pump delivers the mixed air'and fluid. The separator has abafflecone 53 and one or more baffles 54, which cause the liquid to beprecipitated at 55 in the bottom of the separator; and from thence it isled through the pipe back into the pump; the pressure of the deliveredair in the air-drum 56 or the separator being ample to force the liquidto ooze through the passages in the piston to the intake or low pressureside of the pump, so that constant circulation is maintained and thepump is enabled to deliver air at many times the pressure that hasheretofore been found practicable in this general class of pumps. I

@wing to the pressure behind the liquid which is within they cylinder 3,the liquid tends constantly to ooze out between the annular 'flange57 atone end thereof and the head A6 of the drum, whereby this end of the,cylinder is likewise sealed. ln the other end of the cylinder may beprovided one or more perforations 58 through which the liq uid may flowinto the space 24 in which the hub 21 of the cylinder revolves. Fromsaid space, the liquid oozes out between the head 5 of the drumand thisend of the cylinder, thereby sealing the latter, and it also oozes alongbetween the shaft 22 and'` its bearing 59, and near the end of saidshaft collects in an annular pocket 60, from which may lead a duct 61 tothe intake or lowpressure side of the pump, as seen at Fig. 3. Theliquid in the cylinder 3 also oozes out between the sides of the pistonor vane and the walls of the slot 7, 8, to seal this joint, thuscompleting the provision against leakage of air. It will be understoodthat the shoe 34 is not only rigid with the double piston, but alsoabuts against the edges of the cheeks at the inner end of the recess 12,thereby closing the space between the cheeks.

At Fig. 1 it will 'be understood that the liquid passes from the pipe 86constantly through all of the 4orifices 37 directly into the body4 ofthe revolving cylinder 3; and (as indicated by the arrows) from there itenters through port into the space between the cheeks of the doublepiston 9, filling all of said space and oozing out from the tip andsides of the piston. When the piston is turned' through half arevolution from the Fig. 1 position,"the liquid enters from the cylinderthrougl'i port 41 between the cheeks of the double piston 11, with likeresults.`

At Fig. 6 liquid isseen entering from the) piston*l 3 through'nthe port46 between` thev Preferably a cooling coil 62, Fig. 7, is insertedbetween the separator 51.and the pipe 35, tocool the circulating liquid,and thereby reduce the temperature of the pump due to theair-compressing operation. The coil may be inserted in a tank 63 havinga suitable inlet 64 and outlet 65 for a cooling liquid 66.

Variations may be resorted to within the scope of the invention, andportions of the improvements may be used without others.

It will be seen that the principal or only function of gate is toprevent loss of liquid from the tips ofthe double piston as they passthe low-pressure port in the main'drum 1 but in cases where no openingsare provided in these tips, there can be no such loss, and hence thegate 45 may be omitted. will be understood that in some cases theopenings may be omitted from the tips, since the latter may carry upenough liquid orf'drip from the bottom of the drum to effect the desiredsealing of the tips, that is, of those edges of the piston that areparallel with and at the greatest distance from its axis of revolution.

Having thus described my invention, I claim:

1. A rotary air or gas pump comprising a drum, a hollow cylinderrevolving therein, a vane or piston sliding in and out of said cylinderand fitting to the interior of the drum, and means for conducting liquidfrom the cylinder to the edges of the vane to form a seal or packing forthe latter l 2. A rotary air or gas pump comprising a drum, a hollowcylinder revolving therein, vanes or pistons sliding in and out of saidcylinder and fitting to the interior of the drum,

vmeans for supplying liquid to the interior of the cylinder, and meansfor conducting the liquid from the cylinder to the edges of the vanes toform seals or packings for the latter.

3. A rotary air or gas pump comprising a drum, ahollo'w cylinderrevolving therein, means for supplying liquid to the interior of saidcylinder, anda vane or piston sliding in and out of said cylinder andfitting to the interior of the drum, said vane having internal passagesfor the liquid from thecylinder to the edges of the vane. i

4. A rotary air or gas pump comprising a drum, hollow cylinder revolvingtherein,

means for supplying liquid to the interior of of said plates having aportfor the passage of f liquid rom thecylinder into the spacebe`l A setween the plates, and suitable recesses or openings bemg provided at theedges ofthe' means for supplying liquid to the interior ofv saidcylinder, a vane or ipiston sliding in and out of said cylinder andtting to the interior of the drum, said vane comprising opposing lplates slightly separated from each other, to

orm a passage for the liquid from the cylinder to t e ed es of the vanesto vform a seal or packing for t elatter. p ,c

7. A rotary air or gas pump, blower or the like comprislng a drum, avane or piston within the drum andvfitting to the inner wall thereof, arevolving support for the piston, and means for forcing liquid from therevolving support to the edges of the piston to form a seal or packingtherefor.

8. /A rotary a1r or gas pump, blower or the like comprising a drum, avane or piston within the drum and fitting to the inner wall thereof, arevolving su port for the piston, and means for forcing iquid into thepump through said revolving means and to the edge of the piston to formaseal or packing therefor.v 'l

l 9. A double vaneor piston for a rotary airA or gas pump comprising twoplates slightly separated from each other to form internal passages forli uid from the hub portions of the vanes to t e edge portions t ereof,the passages in one vanebeing out of communication-with the passages inthe other vane.

10. A vane or piston for a rotary air or gas pum comprising two platesslightly separat from each other, to form 'an internal passagefor'aliquid from the hub portion of the vane to the edgeortions thereof; saidplates being joined by studs or unionsy well Within the contour .of thevane, to leave previces or recesses around the edges of the Vane.

11'. A double vane or piston for a rotary airI or gas pum comprising twoplates slightly separate from each other to`form internal assages forliquid from the hub ortion of tfie double vane to the edge portlonsthereof, said plates beingunited by means of intermediate studs or latesincluding one at the middle ortion of t e double vane, which servesl toreak communication from one vane to the other. f

12. A vane or piston for a rotary a'ir' or gas pum comprising two platesslightly'separate from each other, to form an internal passage forliquid from the hub portion of the vane to the edge portions thereof;one of said plates being formed at its hub with a port for the admissionof liqui 13. A double vane or piston for a rotary air or gas pumpcomprising two plates slightly separated from each other to form(portion f internal, passages for liquid from the hub pore tion of t edouble vane to the edge portions thereof, said plates being united bymeans of intermediate studs or plates including one at the middleportion of the double vane, which serves to break communication from onevane to the other, each vane formed near itshub portion with a port forthe admission of liquids. K

14. lThe combination with a rotary air or gas pump or the likecomprising a drum, a

gas pumpor the like comprising a drum, a`

hollow cylinder revolving therein, a double vaneor piston sliding in andout of opposite sides of said cylinder and fitting to the interior ofthe drum, said double istoncomprisl ing two opposing plates slig tlyseparated from each other to form internal passages, la plate or/partition being provided at the middle of said d'ouble vane to breakcommunication between said passages,` ports ,being provided on oppositesides of sald partition lto effect communication between the interior ofthe cylinder and the passages in the double piston, of means for forcingliquid into said cylinder and through said ports and passages to theedges of the pistons to form seals for the latter.

16. A rotary air or gas ump comprising a drum havingintake am dehveryports, a vane or piston revolving within the drum and fitting to theinterior walls thereof, means for forcing liquidalong the v ane' to theedges thereof to form a seal or packing for the vane, and means forcuttin(r off the flow of liquid along the vane while the latter ispassing the intake port.

17. A rotary air or gas ump comprising a drum having intake an dellveryports, a vane or piston revolving within the drum and fitting to theinterior walls thereof,`

means for forcino` the edges thereofJ to forma seal or packing for thevane, and means for cuttin off the flow of liquid along the vane while te'latter is passing both of said ports.

18. A rotary air or gas ump comprising a drum having intakean -dellveryports, a

liquid along the vane to.4

@the vane is passing a drum port.

WQ *Arotary air or gas pump comprising a drum, a` hollow cylinderrevolving therein,.a vane or piston sliding in and out of said cylinderand tting to the interior of the drum, a port in said vane within saidcylinder, a passage extending from said port through the vane to theedge thereof, means for supplying -liquid tothe interior of saidcylinder, an

means for closing said port when the vane is passin the intake anddelivery ports provided 1n the drum.

20. A rotary air or gas pump com rising a drum, a hollow cylinderrevolving t erein, a double vane or iston sliding in and out of oppositesides ofp said cylinder and fitting to the interior of the drum, a 'portin each of said vanes within said cylinder, passages eX- tending fromsaid ports through the vanes to the edges thereof, said passages beinout of communication with each other7 an means for closing said ports inalternation to.cut off supplyT of liquid to each passage when its vaneis passing' a port provided in the drum.

21. A rotary air or gas pump comprising a drum, a hollow cylinderrevolving therein, a vane orpiston slidin in and outv of said cylinderand fitting to ttlie interior of the drum, a port in said vane withinsaid cylinder, a passage extending from said port through the vane tothe edge thereof, means for supplying liquid to the interior of saidcylinder, and means for closing said ort when the vane is passing theintake and) delivery ports provided in the drum, said closing meansbeing in the form of a valve or closure rigid with the cylinder andhaving sliding engagement with said piston.

22. A rotary air or gas pump com rising a drum, a hollow cylinderrevolving t ierein, a

double vane or piston sliding in and out of` olpposite sides of saidcylinder and itting to tie interior of the drum, a port in each of saidvanes within said cylinder, passages eX- tending from said ports throughthe vanes to the edges thereof, said passages being out of communicationwith each other, and means for closing said ports in alternation to cutoff supply of liquid to each assage when its vane is passing a portprovided in the drum; said orts being upon the same side of the doub evane and said closing means comprising a valve or closure rigid withsaid cylinder and having sliding engagement with said double vane toclose either of its ports while opening the other.

23. A rotary air or gas pump comprising a drum, a hollow cylinderrevolying therein and 'having heads iitting to theldrum heads, a doublevane or piston sliding in and out of opposite sides of said cylinder andfitting to the interior of the drum, a port in each of said vanes Withinsaid cylinder, passages eX- tnding from said ports through vthe vanes tothe edges thereof, said passages being out of Communication with eachother, and means'for closing said ports in alternation to cut off supplyof liquid to each passage when its vane 1s passing a port provided inthe drum; said orts being upon the same side of the doub e vane and saidclosing means comprisinga valve or closure rigid with said cylinder andhaving sliding engagement With said double vane to close either of itsports While opening the other; said valve or closure fixed to one of theheads of the cylinder and projecting therefrom towards the other headthereof, the vane ports being close to the head of the cylinder whichcarries said closure.

24. A rotary air or gas ump or the like, comprising a revolving hol owcylinder having a head, said cylinder fitting closely between the headsof a drum, a vane or pliston sliding in and out of saidcylinder andtting to the walls of the drum, and means for supplying liuid to theinterior of the cylinder;

said hea of the cylinder having a perforation to permit exudation of theli uid to form a seal or packing between the cy inder-head and the drumhead, passages or ducts leading from the interior of the cylinder alongthe piston to its edges for the ilow of liquid to said edges to seal orpack the same.

25. A rotary air or gas pump orthe like, comprising a hollow cylinderhaving a head,

a drum wlthin which said cylinder revolves,

a vane or piston sliding in and outrof said cylinder and fitting to thewalls of the drum,

and means for supplying liquid to the interior of the cylinder; saidcylinder-head'being perforated to permit eXudation of the liquid to forma seal between the cylinder-head and the drum-head, and passages orducts for the liquid leading from the interior of the cylinder to theedges of the piston to seal or pack the latter.

26. A rotary air or gas pump or the like, comprising a cylindraceousdrum, a cylinder within said drum to revolve leccentrically thereto, avane or piston sliding in and out of the drum, an interior studprojecting from a head of the drum, and having means to control saidpiston, said stud being hollow and having a perforation within'thecylinder, and 12C means for supplying liquid through said stud to theinterior of the cylinder; means being provided to lead the liquid fromthe cylinder to the edges of the piston to form a seal or packintherefor.

27. .rotary air or gas pump or the like, comprising a cylindraceousdrum, a cylinder within-\sa1d drum' to revolve .eccentrically thereto, avane or piston sliding in and out of the drum, an interior studprojecting from a 130 head of the drum, and havingniean's' to con-'Itrol said piston, said stud being holloW and` having a perforationWithin the cylinder, means' being provided to lead the liquid from thecylinder to the edges of the piston to form a seal or packing therefor,a separator 4communicatingvvith the vane or piston, the

latter having a passage forthe liquid to its edges, so that the pressureof the delivered a1r or gas forces the separated liquid to the edges ofthe vane to seal the' same.

29. A rotary air or gas pump or the like,

lcomprising a cylindraceous drum, a cylinder Within sald drum to revolveeccentrically thereto, a yane or piston sliding in and out of the drum,aninterior stud projecting from a head of the drum, and having means tocontrol said piston, said stud being hollow andhaving a perforationWithin the cylinder, means being provided to lead the liquid from thecylinder to the edges of the piston to form a seal or packing therefor,a separator connected to the delivery side of the pump, and a conduitlfor the separate liquid leading back'from the separator to said stud, toenable the pressure of the delivered air to force the separated liquidthrough the cylinder; a cooling coil or refrigerator being included insaid conduit.

l' 30. A rotary air or gas ump or the like, comprising a hollow ,cyliner having a head, a drum Within/Which said cylinder revolves, a vanevor`piston sliding in and out of said cylinder and fitting to the Walls lofthe drum, a separator connected to the deliverysideof the pum a conduitfor the separated liquid leading @ack from the separator to saidcylinder to enable the pressure of the delivered air to force theseparated liquid through the cylinder; passages or ducts for the liquidleading from the interior of thecylinder to the edges `of the iston ltoseal or pack the latter; said cylin er-head being perforated to permitexudation of the liquld to form a sea between the cylinder-head and thedrum-v head; a shaft secured'to said cylinder-head, vb

a bearing for said shaft, and a duct leading from said shaft to 'theintake side of the pump. .t v

3-1. In combination, a pump or compressor having a piston, the latterhaving passages forthe flow of liquid to its edges toseal the same, aseparator for .the liquid connected to the delivery side ofthe pump, acooling livery side of the .both a separatoriJ at the Ypump or engine,and meansl to collect and coil ecnnectedy to said separator, and means?-for conducting the liquid from the cooling' coil to said iston.

82.@'Jllie combination with a pump or compressor, of a cooling coilforming part of a seal the same.

34. A rotary air or gas pump or engine comprising a .d-rum, a vane orpiston fitting the interior Wallsv of the drum, a revolving supprt forsaid vane or piston, and means for forcing liquid through said revolvingsupport 'to the edges of said vane or piston to seal the saine; meansbeing provided at the delivery side of the pump or engine to sepa- 'ratethe liquid, Iand means to conduct it back to said revolving support.

35. A rotary air or gas pump or engine comprising a drum, a hollowrevolving piston-carrying cylinder or member Within said drum and ittingatits ends thereto, the cylinder having openings at its ends andformseal said ends, vsaid circulatory system\ including both a separatorat the delivery side of the pump or engine and means to' collect theseparated liquid and cause it to 'be forced back into said cylinder.

36.A rotary air or gas pump or engine comprising a drum,. a pistonhaving ends itted to the ends of the drum, a revolving member carryingsaid piston, said revolving member forming art of a circulatory systemfor liquid to sea said ends of the. piston, means being provided'forconducting the liquid from said revolving member to said ends of thepiston, and said circulatory system including bothqasparatorV on thede-V ump or engme and means i to cause the li ui collected by saidseparator to flow back t rough said revolving member to said ends ofsaid piston to seal the same again.

37. A rotary air or gas pump or en ine comprising a revolving istondevice, a saft upon which it is secure' said shaft having a earing, saidrevolving device forming part of a circulatory system, means beingprovided to conduct liquid from the-interior of said revolving device'to its ends to seal the same, and said circulator system includingleli-very side of the conduct the separated liquid back to saidreyolving member; a duct leading from the outer' extremity of seidbearing beek to the 10W-pressure side of the pump or engine.

38. Arotery air or gas pump or engine, comprising e revolving pistondevice included in a circulatorysystem, Ineens being rovided to conductliquid from the interior o seid revolving device to its ends to seal thesame, and said circula-tory system also including b otli e separator atthe delivery side of the Lpump or engine and means to collect andconduct the .separated liquid back to lseid revolving memb provided insaid circulatory system lto open and close during the revolution of said(piston device to prevent Waste of sealing lui i FRITZ W. Witnesses :ifi i 4 SAMUEL R; OGDEN,

PHILIP C. OSTERMAN.

er, and a valve device being i-

